Development of a Cold Gas Propulsion System for the ... - SSL - MIT

Figure 6-6. Identification of thrusters by number and letter. Body coordinate axes also shown [38]. ..... 90
Figure 6-7. Static test stand for CGSE flight system characterization. ........................................................ 91
Figure 6-8. CGSE thrust decrease with gas usage. ...................................................................................... 93
Figure 6-9. Valve timing metrics [59]. ....................................................................................................... 100
Figure 6-10. Redesigned CGSE control circuit for a single thruster solenoid valve. ................................. 102
Figure 6-11. Redesigned CGSE control circuit for thruster solenoid valve with hardline dump. ............. 103
Figure 6-12. Simplified diagram of a commanded 40 ms thruster pulse and its actual results. .............. 104
Figure 6-13. Simplified diagram of adjusted command to produce impulse of a 40 ms square pulse. ... 105
Figure 7-1. CGSE 1-DOF horizontal traverse testing on wheels. ............................................................... 107
Figure 7-2. CGSE 3-DOF horizontal traverse and roll testing on air bearing. ............................................ 108
Figure 7-3. GNC data from 3-DOF test of TALARIS hopper, with 45° roll and horizontal traverse. .......... 109
Figure 7-4. TALARIS hopper in vertical test stand, allowing both altitude and attitude control testing. . 110
Figure 7-5. Yaw disturbance rejection demonstrating 1-DOF attitude control of TALARIS hopper. ........ 111
Figure 7-6. Full 6-DOF flight testing of TALARIS hopper. .......................................................................... 112
12